Temporarily avoid using FoundationXML to unblock CI (#1090)

* Temporarily avoid using FoundationXML to unblock CI

rdar://139494302

Co-authored-by: Sofía Rodríguez <sofia_rodriguez@apple.com>

* Workaround an issue where the "references" codingPath component is missing

---------

Co-authored-by: Sofía Rodríguez <sofia_rodriguez@apple.com>

Author: d-ronnqvist

Sources/SwiftDocC/Infrastructure/Bundle Assets/SVGIDExtractor.swift

@@ -1,7 +1,7 @@
 /*
  This source file is part of the Swift.org open source project
 
- Copyright (c) 2022 Apple Inc. and the Swift project authors
+ Copyright (c) 2022-2024 Apple Inc. and the Swift project authors
  Licensed under Apache License v2.0 with Runtime Library Exception
 
  See https://swift.org/LICENSE.txt for license information
@@ -10,12 +10,6 @@
 
 import Foundation
 
-// On non-Darwin platforms, Foundation's XML support is vended as a separate module:
-// https://github.com/apple/swift-corelibs-foundation/blob/main/Docs/ReleaseNotes_Swift5.md#dependency-management
-#if canImport(FoundationXML)
-import FoundationXML
-#endif
-
 /// A basic XML parser that extracts the first `id` attribute found in the given SVG.
 ///
 /// This is a single-purpose tool and should not be used for general-purpose SVG parsing.
@@ -25,14 +19,19 @@ enum SVGIDExtractor {
     /// Exposed for testing. The sibling `extractID(from: URL)` method is intended to be
     /// used within SwiftDocC.
     static func _extractID(from data: Data) -> String? {
-        let delegate = SVGIDParserDelegate()
-        let svgParser = XMLParser(data: data)
-        svgParser.delegate = delegate
-        
-        // The delegate aborts the parsing when it finds the ID so the larger parsing operation is not "successful"
-        _ = svgParser.parse()
-        
-        return delegate.id
+        // FIXME: Revert this and resume using XMLParser when rdar://138726860 is integrated into a Swift toolchain.
+        for capitalization in ["id", "ID", "Id", "iD"] {
+            guard let idAttributeRange = data.firstRange(of: Data(" \(capitalization)=\"".utf8), in: data.indices) else {
+                continue
+            }
+            
+            guard let endQuote = data.firstRange(of: Data("\"".utf8), in: idAttributeRange.upperBound...) else {
+                continue
+            }
+            
+            return String(data: data[idAttributeRange.endIndex ..< endQuote.lowerBound], encoding: .utf8)
+        }
+        return nil
     }
 
     /// Returns the first `id` attribute found in the given SVG, if any.
@@ -47,22 +46,3 @@ enum SVGIDExtractor {
         return _extractID(from: data)
     }
 }
-
-private class SVGIDParserDelegate: NSObject, XMLParserDelegate {
-    var id: String?
-    
-    func parser(
-        _ parser: XMLParser,
-        didStartElement elementName: String,
-        namespaceURI: String?,
-        qualifiedName qName: String?,
-        attributes attributeDict: [String : String] = [:]
-    ) {
-        guard let id = attributeDict["id"] ?? attributeDict["ID"] ?? attributeDict["iD"] ?? attributeDict["Id"] else {
-            return
-        }
-        
-        self.id = id
-        parser.abortParsing()
-    }
-}

Sources/SwiftDocC/Model/Rendering/Variants/JSONPatchOperation.swift

@@ -74,6 +74,15 @@ public enum JSONPatchOperation: Codable {
     ///   - variantPatchOperation: The patch to apply.
     ///   - pointer: The pointer to the value to update.
     public init<Value>(variantPatchOperation: VariantPatchOperation<Value>, pointer: JSONPointer) {
+        // FIXME: The latest Swift development snapshots (2024-10-30-a and later) is missing the "references" path component. (rdar://139446585)
+        // AFAICT it's the only path that's missing components, so we're working around that issue here.
+        // Since the only RenderNode coding paths that have include a topic reference (as its 2nd component) are
+        // modifications of topics in the "references" section, we can detect and workaround this issue by checking for a "doc://" prefix.
+        var pointer = pointer
+        if pointer.pathComponents.first?.hasPrefix("doc://") == true {
+            pointer = pointer.prependingPathComponents(["references"])
+        }
+        
         switch variantPatchOperation {
         case .replace(let value):
             self = .replace(pointer: pointer, encodableValue: value)

Tests/SwiftDocCTests/Infrastructure/SVGIDExtractorTests.swift

@@ -25,6 +25,19 @@ class SVGIDExtractorTests: XCTestCase {
             XCTAssertEqual(id, "plus-id")
         }
 
+        do {
+            let id = extractIDFromSVG(
+                """
+                <?xml version="1.0" encoding="UTF-8"?>
+                <svg viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg" id="plus-id">
+                    <path d="M9.99 0c-5.461 0-9.99 4.539-9.99 10s4.539 10 10 10 10-4.53 10-10-4.539-10-10.010-10zM14.079 10.863h-3.226v3.049c0 0.589-0.323 0.97-0.873 0.97-0.559 0-0.853-0.401-0.853-0.97v-3.049h-3.216c-0.579 0-0.98-0.304-0.98-0.843 0-0.559 0.383-0.873 0.98-0.873h3.216v-3.246c0-0.569 0.294-0.97 0.853-0.97 0.549 0 0.873 0.383 0.873 0.97v3.246h3.226c0.599 0 0.97 0.314 0.97 0.873 0 0.539-0.391 0.843-0.97 0.843z"></path>
+                </svg>
+                """
+            )
+            
+            XCTAssertEqual(id, "plus-id")
+        }
+        
         do {
             let id = extractIDFromSVG(
                 """